They have replaced it with a UHET model called the Stealth (0.8USD / 3l) - which has a 37.5% reduction in water consumption, but a 20% reduction in MAP testing results (scored a rating of 800).  

;decreasing operating costs - this can be as simple as finding a cheaper snow removal or landscaping service; switching to low-flow plumbing fixtures to reduce water consumption; or  more involved projects such as improving the air sealing and insulation of the building envelope to reduce heating costs or expanding the number of rentable units in the property.luck{?}

It wouldn't make sense in a house like this unless you were gutting it imo though Not sure why this would have been directed to me - I suggested he submeter due to his earlier post stating that he could not do that until the lease was up; the lease probably says landlord pays water, but that does not limit the landlord from measuring consumption by submetering - it just means that he can't present a water bill to the tenant.

The water company said lots of people (landlords) submeter, so I'm sure it's not too uncommon.More than anything, I just want each tenant to be responsible for their own consumption.

My understanding of why some say it doesn't is the argument that a tax cut is more effective if it benefits the poor/middle class because the poor/middle class will spend most of it on consumption (say groceries) rather than investment (say purchasing an extra rental property).

I have explored creating a non-profit to assist with tax abatements and consumption of grants but found that I would have to convene a board of directors composed of 3 members and not stand to gain personal profits.

If tenant paid heat reduces fuel consumption by 20% (which I think might be conservative), 1,500 gallons is back at 1,200 gallons with the two systems in your example. 

The one who does only tile, does it fast, with perfect quality and reasonable price.Plumbing as HWT will need permit, repiping the house also need to be done by a licensed professional and even light plumbing like toilets, sinks etc is better done by a plumber by trade rather than by "Jack of all trades" Electrical as of configuring the consumption, breakers, panels etc - only licensed electrician to cover your liabilities.Switches, outlets or something like that not even considered an electric work - like door knobs, locks - DIY while waiting on other contractors to finish or when you have time.Generally, the more you're doing yourself the longer it takes because you're learning new skills and it takes time.Even if you're good in that - if you're creating business and want more than couple projects a year - you need to outsource everything.

However, I applaud you for committing your goals to paper and posting them for public consumption.  

Solar hot water systems (popular in the Carter administration), used large, usually tilted up panels on the roof to preheat hot water or glycol in order to lower the homes electricity and/or gas consumption and to heat hot water.